HP 40gs User Manual page 271

hp40g+.book Page 19 Friday, December 9, 2005 1:03 AM
SYMB key
SHIFT SYMB or
SHIFT HOME keys
SHIFT , key
PLOT key
Equation Writer
Press to clear the value of the highlighted variable.
Press to change the name of the highlighted
variable.
Press to define a new variable (which you do by
specifying an object and a name for the object.
Pressing the key in
the Equation Writer gives
you access to CAS history.
As in the HOME screen
history, the calculations are
written on the left and the
results are written on the right. Using the arrow keys, you
can scroll through the history.
Press to copy the highlighted entry in history to the
clipboard in order to paste it in the Equation Writer. Press
or to replace the current selection in
Equation Writer with the highlighted entry in CAS history.
Press to leave CAS history without changing it in
any way.
While you are working in the
Equation Writer, pressing
or
opens CAS MODES
screen. The various CAS
modes are described in
"CAS modes" on page 14-5.
Pressing followed by the comma key undoes (that
is, cancels) your last operation.
Pressing in the
Equation Writer displays a
menu of plot types. You can
choose to graph a function,
a parametric curve, or a
polar curve.
Depending on what you
choose, the highlighted
expression is copied into the
appropriate aplet, to the
destination that you specify.
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